Sometimes you need to access the top-level/main application (in terms of AIR desktop, it would be the main window, a.k.a the s:WindowedApplication instance that you set as “Default Application” under the default package) directly from your object. The reason for this could be that you have some sort of window manager that you roll out by your own that resides in the “default application” which manages all the windows in your application. You can communicate with the window manager via some event mechanism, or simply directly send a message to it from within your window object, like this: